1911] Promachus and Proctacanihus 155 



Of the other North American species that have been placed 

 in Proctacanthus, exquisitus Osten Sacken must belong to the 

 genus Asilus if one may judge from the figure, for the posterior 

 branch of the third vein meets the margin of the wing dis- 

 tinctly behind its apex; P. virginianus Van der Wulp has the 

 appearance of a species of Erax. The specimen figured is a 

 female and no spines are shown at the tip of the ovipositor; 

 this fact, together with the presence of a stump of a vein at the 

 base of the anterior branch of the third longitudinal suggests 

 Erax, for I have never found a species of Proctacanthus with 

 this character present; Proctacanthus zamon Townsend has 

 been known as a synonym of Eccritosia amphinome Walker for 

 some time. 



List of the Species of Promachus. 

 albifacies Williston, Trans. Am. Ent. Soc, XII, 63. Osten Sacken, 



Biologia, Diptera, I, 1 95. 

 bastardii Macquart, Dipt. Exot., I, 2, 104. 

 laevinus Walker, List II, Ills. 

 rubiginis Walker, Dipt. Saund., L23. 

 ultimus Walker, Dipt. Saund., 136. 



philadelphicus Schincr, Verb.. Zool. Brit. Ges., L867, 389. 

 fitchii Osten Sacken, Catalogue, note 121, 234. 



apivora Fitch, Country Gentleman, XXIV, 63; 3d N. Y. Report, 

 251, plate IV, figure 7. 

 forfex Osten Sacken, Biologia, Diptera, I, 194. 



quadratus Bellardi, Saggio, II, 27, plate II, figure 3. 

 giganteus new species, 

 minusculus new species, 

 nigrans new species. 

 nigripes new species. 



princeps Williston, Trans. Am. Ent. Sue, XII, (12. 

 quadratus Wiedemann, Dipt. Exot., 201; Auss. zw., I, 485. Osten 



Sacken, Biologia, Dipt., I, 192. 

 rufipes Fabrieius, Syst. Ant., 794; Syst. Antl., 109. Wiedemann, Dipt. 

 Exot., 203; Auss. zw. I, 4.S7. Williston, Trans. Am. Ent. Soc, 

 XII, 107. 

 sackeni new species. 

 truquii Bellardi, Saggio II, SO, plate II, figure 0. Williston, Biologia, 



Dipt., I, 322. 

 vertebratus Say, Journ. Acad. Sci. Phil., Ill, 47; Compl. Works, II, 02. 

 Williston, Trans. Am. Ent. Soc. XII, 02. 



Five species of Promachus from Mexico and Central Amer- 

 ica could not be procured so they are not considreed in this 

 paper. They are anceps Osten Sacken, cinctus Bellardi, mag- 

 nus Bellardi, nobilis Osten Sacken and pulchellus Bellardi. 



